这些构筑物形状特殊，结构复杂，钢筋密集。
These structures to be demolished have complicated structure and shape, closely spaced rebar.
部分区域的桥梁构筑物处于盐场的腐蚀环境中，因此，必须进行特殊的防腐设计，以满足结构的耐久性要求。
It is necessary to systematically and contrapuntally study the anti-corrosive special of the bridges in the high-concentration saline region from the design, construction and maintenance.
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